Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 7 17.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(TERRA) TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 07/19/2021   18:00:42   ( -69.99,  89.53) 07/19/2021   18:01:43  ( -70.01,  89.52)    1.58                61
 07/19/2021   18:51:25   (  69.87,-102.98) 07/19/2021   18:51:10  (  69.90,-102.98)    2.84                15
 07/19/2021   19:41:58   ( -69.31,  65.17) 07/19/2021   19:40:48  ( -69.35,  63.90)   49.85                70
 07/22/2021   10:17:00   ( -70.01,-154.56) 07/22/2021   10:18:07  ( -70.04,-154.54)    3.48                67
 07/22/2021   11:07:43   (  69.90,  12.92) 07/22/2021   11:07:35  (  69.88,  12.87)    3.11                 8
 07/22/2021   11:58:20   ( -69.54,-179.22) 07/22/2021   11:57:08  ( -69.60,-179.87)   25.98                72
 07/25/2021   02:33:20   ( -70.09, -38.73) 07/25/2021   02:34:32  ( -70.08, -38.61)    4.73                72
 07/25/2021   03:24:02   (  69.93, 128.83) 07/25/2021   03:24:00  (  69.91, 128.80)    2.37                 2
 07/25/2021   04:14:43   ( -69.78, -63.63) 07/25/2021   04:13:30  ( -69.80, -63.72)    4.48                73
 07/27/2021   18:49:43   ( -70.32,  76.84) 07/27/2021   18:50:55  ( -70.22,  77.47)   26.31                72
 07/27/2021   19:40:21   (  69.96,-115.28) 07/27/2021   19:40:25  (  69.94,-115.28)    2.45                 4
 07/27/2021   20:31:03   ( -69.85,  52.20) 07/27/2021   20:29:55  ( -69.83,  52.21)    2.52                68
 07/30/2021   11:06:06   ( -70.56,-167.59) 07/30/2021   11:07:16  ( -70.46,-166.29)   49.38                70
 07/30/2021   11:56:40   (  69.99,   0.62) 07/30/2021   11:56:50  (  69.96,   0.63)    3.34                10
 07/30/2021   12:47:21   ( -69.88, 168.10) 07/30/2021   12:46:19  ( -69.86, 168.12)    2.88                62